The sougouwiki website has alot of codes from dlgetchu. But sadly am not japanese sometimes it take much time to search, i usually vist 2 of this link to find actress:
here is the fantia page leak, my guess would be that it works as advertisement, the Videos on there always have 10min of the actuall video (what is way more then other short previews) and if you like it then u can buy the dvd release?
Don't bother getting anything labelled BUENA-Pxxx. Those are just the POW series re-labelled as BUENA and have all been shared online already (i.e. POW-072, POW-064, POW-062)